Weather-indicator



w. MARGRAF.

WEATHER INDICATOR.

'APPLICATION FILED JUNE 26.1919. RENEWED APR.25|1921.

1,387,287, I PatentedAug. 9,1921

' INVENTOR ATTORNEY UNITED STATES WILLY MARGRAF, OF NEW YORK, N. Y.

WEATHERINDICATOR.

Specification of Letters Patent.

Patented Aug. 9, 1921.

Application filed June 26, 1919, Serial No. 306,865. Renewed April 25,1921. Serial No. 464,259.

To all whom it may concern:

Be it known that I, WILLY MARGRAF, a cltlzen of Germany, and a residentof New York, in the county of Kings and State of New York, have inventedcertain new and useful Improvements in Weather-Indicators, of which thefollowing is a specification.

The present invention relates to improvements in weather indicators, andmore particularly to one that is constructed to indicate roughly thechange of humidity of the atmosphere. The invention pertains moreparticularly to a hygroscope of the type that depends on the propertysome chemical substances have of changing color with varying moisture.

The main object of the present invention is to provide a hygroscope ofthe type mentioned, which is made in the form of a button, pin or othersmall article that may be secured to the outer garment of a person, soas to be constantly in view for inspection.

Another object of the inyention is to produce a weather indicator of thecharacter specified, which is simple in construction, efficient inoperation and which may be manufactured on a commercial scale, or inother words one which is not so difficult to make as to be beyond thereasonable cost of such acontrivance.

With these and other objects in view, which will more fully appear asthe nature of the invention is better understood. the same consists inthe combination, arrangement and construction of parts hereinafterdescribed, pointed out in the appended claims and illustrated in theaccompanying drawings, it being understood that many changes may be madein the size and proportion of the several parts and details ofconstruction within the scope of the appended claims without departingfrom the spirit or sacrificing any of the advantages of the invention.

One of the many possible embodiments of the invention is illustrated inthe accompanying drawings, in which Figure 1 is an elevation of aweather indica-tor constructed. in accordance with the presentinvention; and F 1g. 2 1s a section taken on line2-2 of Fig. 1.

In the drawings, the hygroscope is shown 1n the form of a button, thatis adapted to be Inserted into the button-hole of a coat lapel. The head10 of this button is made in the form of a receptacle, comprising adisk-shaped back 11, on which rests a disk 12 of paper or similarmaterial, against the latter abutting a front 13, made of fabric.

The three elements mentioned are connected by a rim 14, that is rolledaround their edges. The fabric 13 is convex in shape, the space betweenthe same and the paper disk 12 being filled with an absorbent material15, that has been saturated with a chemical substance which changescolor with varying moisture. To the back plate 11 is attached,

or there may be made integral with the same,

a shank 16, having upon its free end a retaining disk 17 The operationof this device is as follows :The button is secured to the outer garmentof a person by passing the retaining disk 17 through a button hole, forinstance through a hole in the lapel of the garment. The chemicalsubstance, with which the absorbent material 15 has been saturated,permeates the fabric 13, which will change color as the weather changes,that is to sav, when the weather is dry it will have a given color andin damp or moist weather antacle, one wall of which is in the form of afabric, confining in the receptacle a chemical substance that changescolor with varying moisture.

lVhat I claim is 1. A hygroscope comprising a receptacle, a fabric piececlosing the same, and absorbent material within said receptacle incontact with said fabric piece and saturated with a chemical substancethat changes color with varying moisture.

2. A hygroscope according to claim 1,, i comprising means for attachingthe same to the garment of the wearer.

3. In a hygroscope according to claim 1,

eaid receptacle and its fabric covering bemmade in the form of a button.

lgned at New York, in the county of 10 New Yoi'k, and State of New York,this 20th day of June, A. D. 1919.

WILLY MARGRAF.

